Deuteronomy 1:33
Who went in the way before you, to search you out a place to pitch your tents in, in fire by night, to show you by what way ye should go, and in a cloud by day.
Deuteronomy 5:22
These words the LORD spake unto all your assembly in the mount out of the midst of the fire, of the cloud, and of the thick darkness, with a great voice: and he added no more. And he wrote them in two tables of stone, and delivered them unto me.